Teledyne HPAC-2005, Operation Manual

Page: 103 / 156

3 RU SSPA Chassis Operations Manual 205356 REV T 103
7.1 Remote Control - Parallel
7.1.1 Control Outputs
The hardware behind the form C relay is a single pole, double throw relay. Under
normal operation (no alarms) the relays are in an energized state. When a fault occurs
or the controller is powered off, the relays are in a de-energized state. The relay con-
tacts are capable of handling a maximum of 30 VDC @ 1A . The form C relay is shown
schematically in
Figure 7-2
. The form C relay contact outputs are listed in
Table 2-2
.
7.1.2 Control Inputs
All parallel control inputs feature galvanic isolation from the chassis ground. Pull up re-
sistors are provided on each input. To trigger a remote input command, the input
should be pulled to port signal ground. All inputs except the Auxiliary fault input are
pulse activated. Pulse relevant pin to signal ground (J7 pin 19) for at least 20mS for
function activation.
For example: To change the current mute state of the SSPA to opposite, provide mo-
mentary connection for at least 20 mS between pin 17 (Mute Input) of 37-pin connector
J7 to pin 19 (Signal Ground). Subsequent pulses will be ignored until Mute state is
changed to opposite. Typical time for command propagation depends on type of SSPA
and can vary from 100 to 500 mS. Current Mute state can be monitored by dry Form-C
relay contacts 4-23-5.
Auxiliary input is level activated. Auxiliary input function and logic is user selectable
through the front panel or over remote interface.
Mute input is set up to be pulse activated by default. However, by special request it
could be changed to level activated (Mute on Low or High logic levels). Contact Tele-
dyne Paradise Datacom if you need Mute activation logic different than the default.
Common
Relay Energized
Closed on Fault
Open on Fault
Common
Relay de-Energized
Closed on Fault
Open on Fault
Figure 7-2: Parallel I/O Form C Relay